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kteabug · 8 months

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“that’s not my sire” — pup, probably

Summary: At birth pups instinctively know their dam and sire’s scents, it’s what allows them to know who is a safe place. What happens when a pup rejects the alpha that believes they are the sire?

Pairings: BakuDeku (endgame), BakuKami, KiriKami, OverDeku (past)

Word Count: 9, 480

Warnings: Infidelity. Shitty parenting. Minor Character Death. Omegaverse. A!Bakugo. A!Kirishima. O!Kaminari. O!Midoriya. Quirkless AU.

AN: This is based off a silly little head canon I have.

**PLEASE READ: this fic is bakudeku ending, but before we get there, there’s bakukami and then mentions of overdeku.

Bakugo Katsuki knew the omega he was going to marry when he was nine years old. He first saw him at a garden party his grandparents threw, he was the grandson of someone his grandfather knew or something like that. Honestly, he could’ve been the son of the waitstaff and Katsuki would’ve chosen him. His yellow blonde hair, citrine colored eyes and bubbly personality had the alpha captivated. This is based off a silly little head canon I have.

When the two were 16, Katsuki bashfully asked the omega for an official courtship — it was amusing to those around to see the brash and loud alpha seem so docile as he handed the omega a scented shirt and high end blanket he ordered from his parents’ company. Kaminari Denki accepted the gesture with a warm smile as if he had any other option.

When the two were 20, their engagement was announced and within the year, they were married. The Bakugos had wanted to forego the engagement and tie the union together with a mating claim, but the Kaminaris did not — they felt the bond should only take place if and when Denki said so. Bonds cannot be as easily removed as a marital status can.

While it bothered Katsuki to see the hard thick plastic collar around Denki’s neck during their heats/ruts, he understood that it was the omega’s choice. He had always known Denki was it for him, he would wait until the end of time for his omega if that’s what he needed.

After the first year they were together, Denki expressed he was tired of having to wear the anti-claiming collar so Katsuki immediately bought a muzzle. The next year Denki said the muzzle ruined the mood but that he didn’t want to wear the collar so he suggested they spend their cycles in heat/rut clinics. Clinics designed for mated or unmated individuals to ride out their cycles without fear of unwanted bonding or for those who are away from their mates.

Katsuki didn’t really like the idea, it felt so sterile and robotic rather than the passionate nature heats/ruts are. It didn’t feel right to Katsuki for Denki to be alone in a hospital-like room in pain, crying out for relief while his alpha did what? Sat at home like it was just another Wednesday? The thought alone just broke his heart but if that’s what his omega needed then he’d do it.

However after four years, both sides of their families are exhausted waiting for a pup to be born. Katsuki however doesn’t press the issue, when Denki is ready he’d tell him. It’s after their anniversary dinner that the omega’s attitude changes — Mitsuki made a comment about Denki’s appetite which he counters with him being in preheat even though the alpha doesn’t pick up on it. When they get home, Denki practically jumps the ash blonde.

The alpha’s rut is triggered by the intensity of Denki’s actions, the omega hasn’t acted so hungry, so aggressive, so needy with Katsuki before. The sudden action doesn’t allow the omega to wear his collar but somehow he keeps enough sanity to bite his own arm to prevent himself from bonding with Denki. A few weeks later, Denki announces to Katsuki and their families the pair is expecting a pup.

Katsuki is over the moon. If he’s honest (which he won’t be) the moment he smelt Denki’s jasmine scent, he saw a future with a house full of love, warmth and pups. He wanted pups with citrine eyes and soft blonde hair, pups with their dam’s bubbly personality and headstrong nature. He wanted to watch their pups grow up and go off to have their own lives while spending the rest of their lives falling in love with each other over and over again.

Katsuki is there to rub Denki’s back when his morning sickness is rough before carrying him back to bed with crackers and ginger ale. He buys any and every craving the omega has — teasing that the pup must have their dam’s taste since Denki doesn't want spicy foods like Marasu had with him. He reads, talks and sings to the growing bump as he rubs lotion to help keep the omega’s skin moisturized. He tries to go to appointments, but Denki tells him they aren’t really that important for them both to go.

According to Katsuki’s planner, the anatomy scan should be coming up and he really wants to go. He doesn’t care what their sex is, he just wants to see the pup, to be able to look at the screen and call him or her by the name chosen. Denki instantly loved both the names Kats suggested which surprised the alpha but he went with it.

He doesn’t get that as Denki comes home with ultrasound scans announcing it’s a girl, brushing off Katsuki’s complaints by saying he simply forgot it was /that/ appointment today. The entire rest of the day whenever Katsuki tries to bring up anything to do with the appointment or asking to go to just one appointment, the omega claims he’s getting a headache and prompts switches subjects.

Denki claims that the appointments from now on will only last five minutes at tops — it’d be more of a hassle than anything. Katsuki hates it, he wants to be there, to hear their pup’s heartbeat, but he doesn’t want to add stress to Denki so he stays home.

The alpha swallows the ugly feeling that sits in his chest, threatening to come out anytime Denki brushing off something he asks considering the pup. Denki has always been an amazing partner, so it must just be the pregnancy hormones. Kats instead decides to go focus on his daughter’s room — it’s the place she’ll spend the most time so it needs to be perfect.

He divides the wall, painting the lower half a terracotta orange while leaving the upper half an off-white. They picked white furnishings: crib, dresser, changing table, rocking chair and around the room had a few natural wood accents such as the photo frames and wall shelves. This room will grow with her and he can’t help but tear up at the thought.

He folds her burp bibs, sheets and swaddles even trying to match the tiny little socks before just tossing them in a drawer. He hangs up her onesies, dresses, footed pajamas and sleep sacs. Katsuki attempts to fold her white onesies but they are teeny compared to his massive hands.

He even adds a name sign on the door — Yuika: dream come true. That’s what she truly is, a dream come true for Katsuki and he has so much love for her that it spills out in tears. Denki always just shakes his head, but putting a name to the pup he talks to, feels kick, it makes it all feel surreal.

Katsuki plans to be ready for when Denki goes into labor. He has bags packed for him, Denki and Yuika. The car seat is properly installed in their car with the window shades and mirror for the headrest to see her from the rear view mirror. He’s even gone as far as to run drills to make sure he can get himself and Denki to the car effectively for the big day.

All that planning fails the alpha when Denki wakes him up at 3am saying it’s time. Katsuki trips getting out of bed, puts his shirt on backwards and has two different tennis shoes on. But they do manage to get to the hospital unscathed which is a miracle with the way Katsuki was driving.

The maternity ward has scent neutralizer constantly pumping through the air vents — it helps keep things safer for the in labor omegas and their pups. Somehow this helps calm Katsuki’s nerves as he holds Denki’s hand through it all.

Nearly 18 hours later, Yuika is born. She has ten fingers and ten toes with a head of beautiful black hair. Katsuki assumes it’s from Denki’s side since the omega has a black stripe through his own hair and his sire has solid black hair. Like many newborns her eye color isn’t set in stone, but Katsuki hopes she gets the same citrine eyes as her dam.

The scent neutralizer is cut off to their room. After delivery, the room is to be filled only with the parents' scents; pups instinctively recognise their parents' pheromones marking them a safe person. Everyone else who enters the room, regardless of relation, has to wear scent patches — Katsuki is more than on board with this as he doesn’t want Yuika bombarded with too many scents.

Denki holds her the entire first day, rarely letting her go. He doesn’t even put her in the incubator for naps after breastfeeding, opting to just do contact naps. Katsuki tries not to let it bother him, but it feels off. They are partners and yet it feels that Denki doesn’t trust him to hold their daughter. He doesn’t feel like he’s asking for all that much, just a few moments with her in his arms, but Denki continuously waves him off.

The next day however when Denki is taking a much desired shower, Katsuki gets to hold the bundle of joy. All he’s thought about for the last several months has been her — holding her, comforting her, feeding her, loving her. It’s like a crescendo of emotions as he reaches out, gently picking her up and cradling her into his chest. But the high pitch scream she lets out causes all those emotions to just stop.

He’s worried that maybe he woke her up so he starts making the shushing noises, bouncing slightly, and rocking her; all the things the books mentioned but they don’t work. He holds her higher, closer to his scent glands, wondering if maybe he hasn’t been letting out enough of his pheromones, but that seems to worsen things. Thankfully a nurse pops in, giving him a hopeful smile before saying she might just need to be changed.

Later that night he brings it up to Denki, voicing his worries and asking if any of the expecting omega books said anything about it. The omega simply brushes him off, telling him that it was probably because he wasn’t around and she’s just more used to his scent. Katsuki lays away that night, his partner’s words did nothing to ease his anxiety, but maybe tomorrow would fare better.

It doesn’t.

Yuika cries and screams and refuses to relax any time Katsuki holds her or even tries to pick her up. It’s like a knife in his chest that gets twisted each time she fully calms down the second Denki touches her. Why was she rejecting him? Was it him? Did she just not feel safe around him at all?

When the doctor comes for a visit to tell Denki they want him to stay an extra day, Katsuki tries to get an answer from the doctor. He tries to reassure Katsuki that while it’s not exactly common, it’s not uncommon for pups to struggle to adjust to their sire’s scent — especially in cases where the parents aren’t bonded. Bonded couples have a blended scent whereas he and Denki have two very different ones.

Katsuki might’ve believed him if it hadn’t been for the purple-haired nurse whose facial expression showed she didn’t really think that. He follows her out into the hallway and practically begs to know her opinion, saying that he just wants answers to why his daughter rejects him.

He can tell she’s uncomfortable but she relents, explaining that a pup’s reaction is usually only /that/ intense if the alpha present isn’t their biological sire. In cases where a pup fails to adjust are typically more when the sire is a prime or the pup is being adopted. That’s why when adoption is chosen by the omega or female beta, the adoptive parents come around and scent the expectant individual in hopes it alleviates some of the initial scent rejection.

Katsuki doesn’t believe her. Denki isn’t like that. Denki wouldn’t cheat on him. Denki loves him and they are a team. Sure the last several months have felt different than the past three years but hormones can be a bitch so the alpha didn’t take it personally. He then remembers when he brought to Denki’s attention he seems to have gone into labor earlier than it was projected in Kats’ planner, Denki said she was a little premature. Maybe that’s why she’s rejecting him? Though the doctor not mentioning it is a bit weird.

It’s the same the next day too, Yuika screams whenever he holds her so he doesn’t. It breaks his heart to not be able to hold his little girl, but he only wants her to feel safe and happy. So he just does things that help Denki such as making a hundred trips out of the room to refill his water cup, feeding the omega as he holds their princess, and making sure to call a nurse if Yuika needs something when Denki is asleep.

He’s worried more now about taking her home than he was before — their home was heavily filled with his scent. What if his baby girl didn’t feel safe in her own home? He had spent the most time in her nursery, what if she couldn’t rest there? Denki tells him that babies cry and she’ll eventually be fine over time and maybe that’s true, but the alpha is panicking.

The morning of discharge day has Katsuki even more anxious. He practiced getting to the hospital not getting home; over the last few days they had accumulated more things than originally brought. The alpha wanted help getting both Denki and Yuika home, but his parents and in-laws were busy and so were his friends. The omega quickly told him that he had it handled, he would just ask Eijiro.

Now it isn’t that Katsuki doesn’t like Eijiro, the red headed alpha has never done anything to warrant Kats hatred or anything like that. It is more about the way his in-laws turn up their noses when the alpha is mentioned that makes him weary. Denki on the other hand constantly sings his praises, the two were apparently friends in school before his parents sent him off to boarding school.

After discreetly asking around, he learned that Eijiro is the illegitimate grandson of Kirishima Kenji, one of the biggest names in the tech industry. One of his sons decided to keep a mistress and Eijiro is the result, but to keep things mostly under wraps, Kenji moved him and his mother to the family compound.

Kenji even allowed Eijiro to be given their family name rather than whatever his mother’s was and he attended nice academies but not the same as the other grandchildren. Eijiro had been allowed the same lifestyle of Kenji’s biological grandchildren, but the imbalance in status still remained.

Katsuki has met this man a total of three times: engagement announcement party, wedding, and then at the party to celebrate their one year anniversary. All three times Eijiro had drunk quite a bit, but Katsuki couldn’t blame him, the parties were an awful bore. Though he didn’t see Eijiro at their pregnancy announcement party or the other myriad of parties their families threw, so he isn’t sure why the alpha would come up to the hospital.

Surely enough, when he is taking some of Denki’s stuff to the car he sees Eijiro walking into the hospital. Katsuki shrugs it off, maybe the redhead just really hated going to parties and avoided them or hell, maybe Kats just never saw him. He bounces in the elevator, Eijiro will be their first visitor outside of immediate family and he wants to make sure he’s there when Yuika meets him. Yeah he’ll be wearing scent patches, but if she really is super sensitive to scents, it doesn’t hurt to be cautious.

He stops in the doorway when he realizes there’s no crying coming out of Denki’s room despite knowing the omega was in the bathroom changing. When Katsuki looks into the room he sees his daughter happy and content in the stranger’s arms, much like she is in Denki’s. He can pick up on the redhead’s pheromones, assuming he didn’t have patches on and that still isn’t a problem with the young pup.

Then he watches Denki come out of the bathroom, smiling as he leans into Eijiro’s side and the air in his lungs is knocked out. He watches as the two share a look, but not just any look, but /the/ look. The kind you give the person you love with all your heart, the one that’s soft and gentle and anyone who sees it can tell your soulmates. He knows that look because his mom snapped a picture of the two together as teenagers and teased him over the soft expression on his face.

To anyone the two would look like a picture perfect family which fucking hurts because suddenly that makes Katsuki the odd man out.

Midoriya Izuku loves his job. He has always wanted to help people and working as a nurse allows him just that. Being a labor and delivery nurse is just the icing on the cake — being able to help bring pups into the world and help betas and omegas is the best thing. There’s so many emotions that rush through those who have given birth and it’s crucial to have someone that can understand you, that’s where Izuku thrives.

One omega felt like a horrible dam for not breastfeeding her pup, feeling like she was letting her son down. She said that all the mommy blogs said if you formula feed or even pump and use a bottle that you’re selfish, don’t deserve to be a parent, don’t love your kid, and are lazy. She was spiraling on top of all of the postpartum emotions and it broke Izuku’s heart. So he pointed out all the great things she’s done to prove she did love her pup: she made sure he was fed, she held him and soothed him. The biggest sign was that she was worried about being a good parent because bad parents don’t worry about that. The omega thanked him profusely.

One beta had made the choice to put her little girl up for adoption and despite having made it, she was upset. It was a hard decision for anyone to make, it took a lot of strength which Izuku gently reminded her of. He held her hand, releasing a calming scent to surround her in hopes to help her. She asked him if she was selfish for not wanting to keep her baby, saying she just wasn’t ready, but he squashed those thoughts telling her how selfless she was. He then got to introduce the adoptive parents to her who thanked her tremendously. Before the beta left, she made sure to tell him that he had really helped her and the couple said she was always welcome to go and visit.

Some days are harder than others and he’s there for those who don’t leave with the baby they planned to take home. Izuku knows he can’t take that pain away, if he could he would in a heartbeat. He makes little momentos using the baby’s handprint and footprint, sometimes with a photograph of the parents holding the baby if they want. He also uses the blankets they were wrapped in to make teddy bears to send home with the grieving parents. It’s not much, but it’s all he can do to help bring them some comfort. He doesn’t always get a happy thank you like in other cases, but that’s fine; just knowing that one day they’ll be able to see those momentos and smile a little is enough for him.

While he’s used to dealing with dams, he has offered help and comfort to sires as well. He’s there to help show them how to change diapers and not be afraid of changing their outfits — little baby fingers and toes seem to terrify alphas. He helps show them how to hold their heads properly and check footed clothing for strands of hair to prevent it from wrapping around little toes. He watches amusingly at first time and even seasoned sires fret over swaddling and putting little hats on the pups. Smirking at the proud looks on their faces when they excitedly show off their sons and daughters to visitors for the first time.

The last three days he had used personal time and was eager to get back to work as much as he loves being at home. He expects the usual when he gets back, his coworkers catching him up on who is in labor and who has given birth, basically giving him the rundown for the upcoming shift. He doesn’t expect to hear hushed whispers of a scandal with a pup not taking to their sire. Izuku doesn’t care to engage in gossip especially at work, but this really bothers him.

It can be harmful to a pup who is constantly around pheromones that stress them out leading to lack of eating, trouble sleeping and more. He is only half listening and at first wonders if maybe it’s an alpha stepping up to be a sire, it happens and could be why the pup is rejecting them. At least that’s what he wants to believe because the alternative, the possibility of it having been infidelity fills the greenette with rage. Truly someone could not be /that/ stupid to think wishful thinking will override instincts! The nerve!

He’s walking away from the nurse’s station, getting ready to start checking on patients discharging when a blur of blonde passes by. The blonde doesn’t get too far before he falls to his knees as he gasps for air, sobs wrecking his chest. Izuku drops down in front of the man, releasing his soothing scent before taking his handkerchief and wiping the alpha’s cheeks. The omega is unsure why he does that exactly, it’s something he’s only ever done for Kumi and surely not something you do for a strange alpha you just met.

“I…but he…not mine…”

Izuku instantly puts it all together. He’s the alpha his coworkers have been talking about, the alpha who’s little one isn’t taking to his scent and the omega’s heart breaks. He’s seen it happen before, an affair exposed by a pup’s rejection — had to call security for it and everything but usually the wronged alpha is angry. The alpha will yell and scream, storm out, maybe have tears in their eyes, but nothing like this. Most times there’s some sort of inkling that there’s an affair going on, but the blonde seems to have been completely blindsided.

The omega helps the alpha up and into a nearby chair, trying to comfort him but what could he say?

It will be okay.

Izuku hates that phrase because he can’t say that confidently.

Things will work out.

Izuku cannot promise that.

Everything happens for a reason.

Izuku wants to gag every time he hears that being told to people.

“I appreciate you not wanting to bullshit me.” Katsuki lets out something of a laugh while sniffling.

Izuku turns pink, he thought he’s been getting better about mumbling. But despite his embarrassment he’s glad he got the alpha to laugh a bit.

“There you are, Midoriya! I got worried when you didn’t answer a page!” The same purple-haired nurse from before says.

“I’m sorry! I got distracted.” The omega tilts his head to the side and gives her a blinding smile.

“It’s my fault.” Katsuki adds, for some reason he feels the need to protect the small omega, “I was upset and he made me laugh.”

The nurse recognizes the alpha immediately — not just from having spoken to him previously but because she was just in his omega’s room and witnessed probably what had upset him. Some redhead alpha holding a very calm pup, a pup that up until now he believed to be his. “That’s Midoriya’s quirk!”

The greenette snaps his head at her, with a very motherly ‘stop it’ look but Katsuki beats him to it.

“Quirk?”

“Yeah, it’s like a superpower. It’s from Izuku’s favorite kid’s show!”

“Kid’s show? I’ll have you know that All-Might’s Mighty Adventures is a very popular classic TV series! Kid’s show? Hah, just because it’s animated doesn’t make it for children.” Izuku continues to defend the show, leaving a smirk on the nurse’s face and a faint blush on the alpha’s — the omega misses both of them.

Kaminari Denki had been told what to do and when to do it since he can remember, though he’s pretty positive it’s been like that since he was born. It probably went back further to when he was conceived, he’s certain his dad demanded he be a male and his mother willed him to be an omega. Though with the chill in his parents’ marriage, maybe he was a designer embryo grown in a lab.

Being born in a wealthy family has its upsides, but also most definitely its downsides. Especially when it’s a family that’s not secure it’s in holdings — you see the Kaminari family is what one would call ‘new money’ and it only dates back to Denki’s grandfather. His grandfather got lucky with a few investments when Denki was three and having a friend owe him a favor ended up with his grandfather rubbing elbows with Bakugo Mamoru (Mitsuki’s father). That allowed the Kaminari's introduction to other more prominent families like the Todoroki’s (hotels), Kirishima’s (tech) and Yagi’s (entertainment) who are what’s called ‘old money’.

When Denki presented at five, his parents had been so thrilled — male omegas still hold a lot of value in the upper class and are sought after. Some more traditional wealthy families prefer having alpha/alpha couples take over the company so an omega is useful for producing heirs and quelling ruts. Denki’s parents want more, more wealth, more fame, more status, so using their son to “marry up” was just par for the course.

When he was seven he was sent to a decent private academy and that’s where he met Kirishima Eijiro — a shy alpha who transferred in mid school year. His seat was placed right next to Denki and it was love at first sight for the omega. Every chance he got he would try to get to know the alpha more, break through his shell and then finally right before the school year was over Eijiro smiled at him. The two became inseparable, so much so that Denki once screamed until Eijiro was allowed to have his seat moved to be next to his.

At first his parents were pleased, Kirishima is a very well known name, but then they heard the hushed whispers of Eijiro not really being a Kirishima. It didn’t matter that for the first time in his life Denki had a friend, that he smiled more now and that being around the alpha helped the omega do better in classes. No, their child’s happiness didn’t matter, what mattered was their own selfishness in knowing a bastard son-in-law would do nothing for them.

So when Denki was sent away to boarding school without getting to say much of a goodbye to Eijiro before going. When his parents called him home for a stupid party, he had a little hope that Eijiro would be there, his family is one that would make an appearance. He looked and looked, but he wasn’t there. That was the night that he caught another alpha’s eye, one that his parents were all too thrilled about. Denki thought he stunk — his spicy cinnamon clove scent hit his nose funny, not like the sandalwood scent Eijiro had.

But once again, Denki was told what to do and when to do it when Bakugo Mamoru reached out to his grandfather about his grandson, Katsuki’s interest in Denki. He tried to protest, claiming that he already had an alpha, but his mother simply laughed at him and his father grabbed his face hard, nearly using an Alpha Command on him. Tears blurred his eyes as he nodded that he understood Bakugo Katsuki would be the only alpha for him and that he was never allowed to mention Eijiro again.

There was nothing wrong with Katsuki. In fact if he had never met Eijiro, Denki was sure he could’ve fallen in love with him, but he did. He did meet Eijiro and no other alpha compared. It wasn’t Katsuki’s fault nor was it his; when money is involved, feelings really don't matter. It had been during one of their chaperoned dates that by chance Eijiro walked into the same restaurant and his eyes locked on Denki’s. The omega had wanted to plead with him, but he gave him an expression that said ‘oh I understand’ and Denki cried so hard Katsuki thought he overstepped by not wearing scent patches and took him home with an apology.

When he was 16, his mother forced him to accept the blonde’s courtship offer and his fate was sealed. When he got home later that night, he realized that his nest had been completely ransacked. His baby blanket was gone, his favorite fuzzy blanket that he got when he first presented and his plushie.

The plushie had been hidden in the corner of his nest that Eijiro had gifted him before they changed schools. It had long lost the alpha’s scent but it brought him comfort — he was careful to keep it from his parents, but clearly not careful enough. His parents had also completely replaced the nesting mattress and base, saying something about him needing a proper nest now that he was a taken omega. Denki hated it because the new nest wasn’t comforting to him, it felt stiff and sterile and all he had was the blanket and shirt from Katsuki to fill it.

The day after he turned twenty, their engagement was announced and Denki fell apart when he caught the scent of sandalwood among the guests. He saw red eyes, ones that were slightly similar to Katsuki’s but not the same at all, and they were filled with anguish. His black hair is now a bright red and he seemed to be on his grandfather’s heels. Denki ended up at the bar toward the end of the party, watching how happy Katsuki acted as he chatted with his friends when Eijiro sat a few seats down. Denki sent a drink his way, an apricot fizz (please look my way) while EIjiro sent him back an old fashioned (I’ll go my way).

Denki felt like a zombie on the day of his wedding. His mother made him go through what she called a ‘professional omega cleanse’ — he was stripped down and every part of his body, inside and out, was scrubbed, hard. He was then humiliated by having to go through a ‘virginity exam’, something that no one but his own family pushed for. Apparently his parents were taking pride in what a perfect specimen their omega son was. Everyone cooed at the tears that ran down his eyes up at the altar, thinking the omega was overjoyed, but instead it was because he saw an emotionless expression on Eijiro’s face right after he said ‘I do’.

The omega tried. He really did, but Bakugo Katsuki would never be the alpha he held dear in his heart. The alpha really was the perfect mate and he would be…for someone else. He had hoped he’d get pregnant the first year, his heats were more miserable with Katsuki than without him, but he was used to not getting what he wanted from life. After a year he had enough and brought up spending their mating cycles apart. He could see Katsuki’s hesitation but most of Denki’s life was spent doing things he didn’t want so surely Kats could make this sacrifice for him. And he did. In fact Denki learned that Katsuki would bow to anything and everything the omega asked of him.

Denki had been married for three years when he finally saw Eijiro again — both leaving the same heat/rut clinic. Something about knowing Eijiro wasn’t sharing his ruts with another made the omega feel warm inside. He asked the alpha to a nearby cafe and that’s how it all began. Eijiro was still the puppy-dog that he had always been and apparently showed his grandfather he had more potential than his other grandsons. It was innocent, the alpha respecting the fact Denki was bound to another…all until Denki lied.

Telling Eijiro that Katsuki was more focused on work than him, that he was disgusted by the omega’s heat and he’d overheard the blonde saying their relationship was just transactional. He told him that Katsuki turned down a mating claim when in fact it was Denki’s parents that had — since a mating claim can only be broken upon death, they felt withholding it gave them an upper hand to potentially control the Bakugos (it did not). Eijiro had been livid and easily fell into the omega’s trap: so Denki would simply tell Katsuki he was heading to the clinic and instead go to the nearby hotel where Eijiro was waiting for him.

The omega was on cloud nine, his parents left him alone and he got the alpha he wanted. Eijiro doted on him, worshiped him and wholeheartedly loved him, he wanted for nothing when the alpha was around. But it was short-lived when Eijiro tried to end things, saying that it was wrong and he couldn’t stand the person who looked back at him in the mirror. So Denki lied, claiming Katsuki had a side piece, and some other things that got Eijiro to spend one more heat with him. But before he could try to figure out how to prolong his affair, he missed a cycle and a cheap plastic test told him he was royally fucked.

Six weeks. He was six weeks pregnant and it would be very apparent it wasn’t his husband’s. So the night of their fourth anniversary, after his mother-in-law’s comment about his appetite and his ‘pre-heat’ rebuttal led to him sleeping with his husband. It’s uncommon for an alpha/omega couple to get pregnant out of heat/rut periods but thankfully for Denki, his actions triggered Katsuki’s rut. But maintaining the lie wasn’t as easy as he thought it would be. Katsuki, who was already a doting alpha, somehow became even more doting and wonderful, making it hard for Denki to really figure things out.

Katsuki wanted to attend the appointments, but they would say the gestation week and it wouldn’t line up with the timeline Katsuki had mapped out in his planner. At first he could use the alpha’s meetings as reasons he had to go alone, but that didn’t last long because he just asked Mitsuki to cover him. He wanted to see ultrasounds so Denki lied and said there was a power outage so the dates were wrong when the system rebooted. The hardest was hearing Kats going on and on about the anatomy scan, mainly because he already had it so he said he picked a random appointment and came home playing it off as he just now knew they were having a girl. The further along he got, the more attentive Katsuki got, the more annoyed Denki got — after all he wanted his pup’s sire to be doing these things, not Katsuki.

Denki really had thought that because Katsuki spent so much time around him, Yuika would accept him as her sire. Why couldn’t he get anything he wanted? He tried to play it off as normal behavior but his own instincts were going haywire by not having Eijiro around, by some other alpha touching Eijiro’s pup. Each time Yuika screamed, he wanted to shake her until she stopped and would listen. HE had always behaved. HE always did as he was told. HE always listened. HE never disobeyed. Why couldn’t SHE?! Suggesting Eijiro to be the one to come was his last stitch effort in getting her to just calm down for a second. But the moment he saw her relax in the redhead’s arms and Ei looked down at him with pure adoration, he knew that everything was ruined.

Katsuki waited a week to confront Denki, mainly because he had enough self respect to not make an ass out of himself in front of the plethora of visitors they had. He had called Mitsuki to watch Yuika as he talked to Denki, who thankfully didn’t try to lie about things. He stood there as the omega confessed, telling him the various lies Eijiro had been told and then he dropped to his knees in front of Katsuki. He begged the alpha not to leave him, that his parents would kill him if they ever found out and even offered up his mating claim to the alpha. He used the alpha’s love for Yuika to try to persuade him to stay.

As he looked at the omega he could no longer see the one he fell in love with, the one he wanted more than anything to spend forever with. But had Denki ever been that man or had it been rose colored glasses? He was disgusted he tried to use Yuika as a bargaining chip and it was because of the alpha’s love for her that he had to leave. The once fond memories were now tainted and he can’t promise that he won’t grow to resent her if he stays — maybe that’s selfish of him but he’d rather not know her than to end up hurting her.

He also cannot forgive Denki, he’s upset he cheated, but what really hurts was that the omega never talked to him. If he would’ve just told Katsuki about his feelings, about not being interested in him, he’d have helped out. It made his blood boil that the Kaminari’s had used their own son the way they had, but Denki made his choices on his own. He would’ve talked to his parents and ended the courtship where /he/ looked like the ‘bad guy’ rather than Denki and helped him any way that he could. The omega chose not to do that. He chose to lie, cheat, and manipulate and that bell couldn’t be unrang.

Katsuki left the apartment the next day, taking his clothes and personal items, leaving everything else to Denki. His in-laws tried manipulating him into staying with their son but his grandfather shut that down immediately and the divorce was swift and easy for the blonde alpha. By chance (read: he essentially stalked the hospital) he ran into Izuku a few months after the confrontation. He wasn’t sure why he felt such a pull to the nurse, but just the short conversations they shared had him feeling like a child with a puppy dog crush. A few weeks of ‘random’ run-ins and he finally asked the nurse for dinner.

- -

Izuku couldn’t help but like the attention from the blonde alpha, however it also felt wrong. Izuku’s fingertips gently grazed the scar on his mating claim as he watched his four year old, Kumi, coloring. If he hadn’t given birth himself, he’d be convinced his mate had done so. Kumi had his sire’s dark brown hair and heliodor-colored eyes, he’s so much like Kai that sometimes it hurts. All he has of Izuku is a handful of freckles dusting his nose.

Izuku met Chisaki Kai at work which didn’t surprise anyone, the omega basically lived there. Kai was a pediatric oncologist and they met in the cafeteria — both reached for the same last packaged melon pan. After both tried to pull the ‘no you’, the doctor relented taking it, but when he passed Izuku’s table he slipped it on the nurse’s tray. That singular event triggered a whirlwind romance that resulted in a mating claim ten months later. If you ask anyone in the hospital, they couldn’t name a couple that seemed more perfect.

There was no denying that Kai only had eyes for Izuku, the alpha was absolutely whipped for the tiny omega. The doctor always wore a black face mask, but the smiles on his face when Izuku was around or even mentioned were obvious. He doted on the greenette, always making sure he didn’t work too hard, making sure he took breaks when he needed and somehow all the alpha’s breaks ended up with him on the maternity floor. Everyone thought the two couldn’t get anymore disgustingly in love with each other, but then Izuku found out he was expecting. If Kai was over the top before, he was five times that during the pregnancy.

He just happened to be on the maternity floor nearly every hour to make sure the omega wasn’t overdoing it and that he was drinking his water. If he couldn’t, he’d page one of the OB-GYN to check in with his mate. At home, the alpha wouldn’t let Izuku lift a finger, constantly doting on Izuku and the pup; he even tried to carry him to the bathroom though the greenette put his foot down and said no. Kai attended every appointment, fulfilled every craving and talked to the baby daily. Izuku struggled to believe he deserved such a great alpha, but Kai was there to kiss away each negative thought and reassure him every time he needed it. Kai cried the day Kumi was born, thanking Izuku repeatedly for giving him an amazing life, mate and pup.

Things were perfect.

Until they weren’t.

Shortly after Kumi’s first birthday, Kai lost a patient — a little girl named Eri and he took it harder than most cases. He told Izuku he just wanted to go out for a night drive, something he would do after a bad day, so he kissed his omega and pup goodnight saying he’d be home soon. Izuku got a call from the hospital three hours later, telling him there’d be an accident. Truck ran a red light and crashed into Kai’s car, there was nothing they could do. For weeks Kumi cried for his “dada” but Izuku couldn’t give him the one thing he wanted and if it wasn’t for his mother, he’d have fallen completely apart.

It took eight months before he could go back to the hospital, thankfully he was able to take extended leave to be with Kumi and properly grieve. He smiled and was there for his patients but he wasn’t the same, nobody expected him to be. The first anniversary of Kai’s passing the omega was inconsolable, sobbing so hard he threw up and he couldn’t even look at Kumi for two days. Izuku felt like maybe Kumi looking exactly like Kai was his punishment for taking an alpha like Kai and keeping him all for himself, he was just a male omega born to a single dam after all. Nothing special.

For his third birthday Kumi asked for a superhero party and Izuku assumed it was because the two often watched All Might’s Mighty Adventures. Then one night Kumi surprised him by saying he wanted the superhero decorations that looked like his daddy and the omega sobbed for hours after his pup went to bed. Kumi then became a wonderful reminder of Kai’s love and compassion and Izuku felt like things were really working out for him. Then a blonde alpha showed up and threw his world upside down.

Izuku couldn’t deny the way he felt about Katsuki or the pull he felt toward the alpha. He didn’t just have himself to think of, but Kumi and then there was everything that happened with the omega in the hospital. Then there was his mating claim scar; typically when bonds break the mark fades within a year, but he and Kai had constantly marked each other, practically engraving their love on the other’s skin. A doctor told Izuku that it was rare, but it could happen when a pair repeatedly bite over the claim and that some old stories say it’s a sign of an undying love. Izuku wasn’t so sure another alpha would be okay with that kind of reminded of a past mate.

- -

Three Years Later

Eijiro’s exhausted, long hours in an office building isn’t what the alpha thought his life would be. When his grandfather found out about Denki and Yuika, he saw a whole different side of the man — he slapped Eijiro across the face and screamed at him. He told him that he was no better than his mother, just another mistress whore and a worthless alpha. Kenji had hoped Eijiro wouldn’t disappoint him, it’s why despite his illigitmacy he wanted Ei to take on one of their companies. Instead he got demoted to being a basic paper pusher, further darkening the black smudge that he was on the family’s name.

Kenji met with Kazuki (Denki’s grandfather) and Mamoru (Katsuki’s grandfather) to hope to smooth things over and make sure further endeavors weren’t tainted. Kazuki apologized for his family’s behavior, he had been in the dark about the whole thing and was willing to accept whatever the others decided, even if it was severing business ties. Mamoru said he wanted a clean divorce for Katsuki, they wouldn’t slander the Kaminari name in the press saying it was all due to irreconcilable differences and wouldn’t speak on the matter. Despite the clear evidence the blonde alpha wasn’t the sire, they would do a DNA test just to cover all the bases and protect Katsuki and the pup.

Kenji said that Denki and Eijiro would mate, not just marry and that it was non-negotiable. He wouldn’t allow Eijiro to further ruin the Kirishima name or have Denki embarrass his grandson by going around saying whatever to whichever alpha would listen. Kazuki agreed, the bond would be more as a punishment than a reward for their behavior, the two wanted to be together so badly, they would now spend the rest of their lives together. Eijiro would still be allowed a job within the family company to support the omega and pup, but he wouldn’t be in the limelight or seen at any events. That also meant that Denki wouldn’t be seen out either, he would be allowed to visit the family compounds but nowhere else.

The red-headed alpha drags his feet to go home, nothing’s been the same since that day at the hospital. When Denki told him he was pregnant, he never said anything about her being his, so he distanced himself. He didn’t attend any parties or anything affiliated with the Bakugo family. He was already struggling to live with himself being no better than his own parents, but when Denki texted he needed help getting home with the pup he felt the urge to help. Eijiro knew the second he saw that little girl that she was his daughter and when Denki leaned against him, he saw a life he always wanted. Then the truth came out: the omega lied to him, repeatedly.

Katsuki wasn’t a monster at all. He wasn’t more focused on work, he returned home early every day. He wasn’t disgusted by Denki’s heat, he was respecting what the omega asked him. He never called their relationship transactional, he was head over heels in love with him. He never denied a mating claim, Denki’s parents were withholding it. Katsuki never had a mistress, he spent all his time working to provide for his family or doting on Denki. Eijiro didn’t recognize Denki after he untangled all the lies, he surely wasn’t the omega he fell in love with all those years ago. And now…now he’s stuck with him.

- -

Denki finally has everything he had wanted, mated to Eijiro and had his pup, but it’s nothing like he thought it would be. Eijiro doesn’t bother to look at him and if he has to, he just gets a neutral unreadable expression. The only time he sees pieces of the alpha he loves is when Yuika is around or involved, she gets all the love and attention Denki wanted from the alpha and he /hates/ her for it. Once they left the hospital, he refused to do anything with her, demanding a wet nurse, night nurse, nanny, any and everyone that worked with pups to be hired to handle her. When his parents got wind of this, they berated him and Kenji allowed for Eijiro to have leave to bond with the pup.

The omega tries to entice Eijiro, flaunting his pheromones especially pre-heat ones, but to no avail. At first, Eijiro simply ignored Denki, then he began leaving boxes of scent patches around before telling the blonde to spend his heat in a clinic if he needed to. That only further upset Denki who tried to lock himself in their room for attention but got nothing from the alpha. Instead Eijiro moved into one of the spare rooms and continued on with life.

Denki watches as Eijiro comes into their apartment, face unreadable until Yuika rushes to him and the alpha lights up. He rolls his eyes as she asks about his day, excitedly telling him about hers and how her nanny made her lunch just like he does. The omega watches as Eijiro relives the nanny as he takes over childcare for the evening — playing games with her, making her dinner, giving her a bath, reading her a book before tucking her in. Denki watches as Eijiro walks out of her room and back into the main area of the house, it’s as though he doesn’t exist as the alpha moves around him.

“So you’re just not gonna speak?” He spits at his /mate/.

“You’d just lie anyways.”

The omega pushes himself off the couch and slams the front door behind him. He doesn’t give a fuck anymore that he’s supposed to stay out of sight, not cause anymore issues, he cannot stand being trapped in that suffocating house anymore. He misses the way things were with Katsuki — how HE was always first to the blonde alpha, HE was the one that loved and HE was the one that got all the attention. HE deserves those things, to be the one doted on and cared for, HE did everything he was told to so why was he being punished?

He’s turning a corner, heading towards some cafe when he freezes, hearing that all familiar husky voice. Denki realizes how awful he looks: dark bags under his eyes, oily hair, he’s exhausted and simply looks a mess. At first glance he probably looks like a tired parent, but it’s due to being mated to an alpha that he doesn’t have a solid bond with. But maybe his looks won’t matter, Katsuki has loved him pretty much his whole life, so he’ll see through such a trivial thing. He looks at his reflection in a shop window, fiddling with his hair and smoothing his shirt. Denki feels something for the first time since he was forced to mate Eijiro and excitedly walks towards the blonde alpha.

The omega’s face completely drops when he takes in the sight of Katsuki with a pup much older than Yuika on his shoulders. What really sours his mood is seeing the alpha walking next to a basic looking pregnant omega. How could Katsuki just replace him like that? Sure he wanted out, yeah he wanted to be with Eijiro, but Katsuki never showed interest in anyone else. He had even told Denki that, that no other omega had or would ever catch his eye, so Katsuki is just a liar! Not to mention he clearly lost any standards by being with someone that was no more than damaged goods with a pup.

That could’ve been him. Instead he’s stuck with Eijiro and Yuika, two people that make his life miserable. Two people that have done nothing but ruin his life and take away everything that he worked for. He hates them. He hates them. He hates them. He sees Katsuki laughing at something the pup said, smiling lovingly at that whore of an omega and Denki feels sick.

- -

Katsuki never thought he’d fall in love with another omega. His whole life was Denki Denki Denki. Then he met Izuku. Waiting an appropriate time to approach the omega had been difficult because he was ready right then, that moment he left Denki, he was ready. But that wouldn’t be fair to Izuku especially since he knew the story, it would make the greenette feel like a rebound — he could not have that.

Izuku had been upfront and completely honest with Katsuki. On the first date he told the alpha that he had a late husband, a pup, and a mating scar. He told him that if any of that bothered Katsuki, there’d be no hard feelings between them. With such kindness in his eyes, he bluntly told Kats that he didn’t want to waste either one of their time. The blonde wanted to say he loved him right there in that moment, but he settled for simply nodding; his honesty was refreshing after everything.

It took six months for him to meet Kumi and despite not being a newborn, Kats was worried he’d reject his scent. To both his and Izuku’s surprise, within an hour of their first meeting Kumi blatantly told them the alpha’s scent was comforting. At first Katsuki was worried that with Kumi, he’d be living in Kai’s shadow — he never wanted to replace his sire, just be another alpha figure he could look up to. He just wanted to add to those the pup felt safe around. A year in, while he was tucking Kumi into bed, the pup looked up and said “did you know my Daddy was a superhero? Pretty cool huh?” Without skipping a beat, the alpha said that was amazing and retold a story Izuku told him, smiling as Kumi’s eyes sparkled.

Nearly two years into their relationship, Kumi called Kats ‘papa’ in passing; he never noticed the large loop he had thrown the couple into. Izuku immediately felt horrible, that he selfishly moved too fast and now his son was forgetting his sire; something that the omega swore he never would let happen. Katsuki panicked, worried he overstepped, worried he somehow messed up. Then the pup asked, “hey Papa, did Ma ever tell you about the time Daddy…”

Katsuki is nervous. Like to the point it feels like his stomach is turning inside out and he’s gonna puke. Technically he’s been in this exact position before, standing next to an omega giving birth, but this time it’s different. This time the love between them is mutual, everything he does is appreciated, and it’s so clear what was missing in his past relationship.

The nurses pass the tiny little pup back to Izuku who coos preciously before telling Kumi to look at his baby sibling. Kumi has a huge smile on his face, excited to finally meet them. Discreetly (read: not discreet at all) Katsuki sniffs himself, worried that the pup will reject his scent just like Yuika did. Izuku reassured him that won’t happen, never taking offense at the alpha’s worry, but he couldn’t help it. Time hasn’t fully healed that wound — he had even gone as far as having Izuku heavily scent him before they came to the hospital.

The tiny bundle is offered to Katsuki who gently takes them. His hands are sweaty as he pulls the swaddled pup into his chest, heart nearly beating out of his chest. He closes his eyes and waits. He waits for the babe to start screaming, to become uncomfortable and search for a different scent, just like Yuika had done. He braces himself, tears pooling in his eyes as any moment now the pup will wake unsettled.

That never comes.

When he opens his eyes, he sees a peacefully sleeping pup in his arms. No screaming. No fussing. No fear. Tempting fate, he pulls the baby up closer to his chest, letting out just a bit more of his pheromones knowing things will drastically change. They don’t. Instead the pup wiggles to get a bit more comfortable before relaxing into Katsuki’s hold and the alpha loses it. He starts crying, unable to stop the waterworks as Izuku tries to comfort him. Kumi very proudly states that he told his Papa he wouldn’t stink to the new baby and Mitsuki finds herself holding back laughs as she records the entire scene.

It took time, as with all things, but Katsuki’s heart completely healed — thanks to a wonderful green-haired nurse, of course.

#my hero academia #boko no hero academia #bakudeku #bakugo x midoriya #bakugo katsuki #midoriya izuku #kirishima eijirou #denki kaminari #chisaki kai #cw infidelity #cw cheating #omegaverse au #omegaverse #alpha katsuki #alpha kirishima #omega Kaminari #omega izuku

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